With OpenPGP Applet you can
encrypt or sign text using the public key encryption of OpenPGP.

It is unsafe to write confidential text in a web
browser since JavaScript attacks can access it from inside
the browser. You should rather write your text in a separate
application, encrypt it using OpenPGP
Applet, and paste the encrypted text in your browser, before
sending it by email for example.

When using OpenPGP Applet to encrypt emails, non-ASCII characters (for example non-Latin characters or characters
with accents) might not display correctly to the recipients of
the email.

If you are going to encrypt emails often, we recommend you to set up
Thunderbird instead.

This technique requires you to use public-key
cryptography. If you never used OpenPGP keys before, you might
rather want to encrypt your text using a passphrase with OpenPGP
passphrase encryption. See the corresponding
documentation.

Write your text in a text editor. Do not write it in the web browser!

Click on OpenPGP Applet and
choose Open Text Editor to open
gedit.

Select with the mouse the text that you want to encrypt or sign. To
copy it into the clipboard,
right-click on the selected text and choose Copy from the menu.

If you want to encrypt the text, select one or more public keys for the
recipients of the encrypted text in the Choose
keys dialog box. To select a public key, double-click on the
corresponding line in the Select recipients list
box.

If you want to sign the text, select the secret key with which you want to
sign the text in the Sign message as drop-down
list.

If you want to hide the recipients of the encrypted text, select the Hide recipients check box. Otherwise anyone who sees the
encrypted text can know who the recipients are.

Click on the OK button.

If you receive the warning message Do you trust these
keys, answer it accordingly.

If you selected one or several public keys to encrypt the text,
OpenPGP Applet now shows a
padlock, meaning that the clipboard contains encrypted text:

If you only selected a secret key to sign the text, OpenPGP Applet now shows a seal, meaning that the
clipboard contains signed text:

To paste the encrypted or signed text into another application,
right-click in the application where you want to paste it and choose
Paste from the menu.

For example, you can paste it into the web browser to send it by email.